Iron Man 2 opened to an impressive $128.112 million from a record 4,380 theaters ($29,252 per theater average), or nearly $30M more than what the original Iron Man opened to in 2008 ($98.619M / $24,024 PTA).

While impressive in its own right, the weekend estimate was for an even more impressive $133.6 million and projections heading into the weekend assumed that the film could clear $140-160 million, possibly breaking The Dark Knight’s 3-day opening weekend. That obviously didn’t come close to happening.

The daily breakdown was $51.24 million on Friday (which includes about $7.5M from midnight screenings), $45.776M on Saturday (-10.7%) and $31.107M on Sunday (-32.0%). With about a weeks head-start in international markets — an estimated $194M — Iron Man 2 has grossed $322.122 million wordwide.

Rounding out the top three were A Nightmare on Elm Street in 2nd place with $9.119M (down -72.3% from the weekend prior and with a cume of $48.48M) and How to Train Your Dragon in 3rd place with $6.68M, which pushed its domestic cume past $200M ($201.014M). Click over the jump for the daily chart.